Updated test for removing image.

The post call is now changed with an ajax call, which is
accurate with the updated code on commit 071e90b.

All tests (53) are passing both by running `grunt test`
and `testem` now.

Author: bertzzie

test/images.js

@@ -313,9 +313,9 @@ asyncTest('deleting file', function () {
         .append('<figure><img src="image1.jpg" alt=""></figure>'+
             '<figure><img src="image2.jpg" alt="" class="medium-insert-image-active"></figure>');
 
-    this.stub(jQuery, 'post', function () {
+    this.stub(jQuery, 'ajax', function () {
        ok(1, 'ajax call created');
-       jQuery.post.restore();
+       jQuery.ajax.restore();
        start();
     });
 
@@ -525,4 +525,4 @@ asyncTest('file size validation', function () {
         files: [{ type: 'image/jpeg', size: 1001 }]
     });
 });
-*/
+*/